bash

bash
 n.— «Existing dealers in Dumfries, keen to meet demand, have been cutting the drug with potentially fatal fillers, or “bash” as it is known on the street, which can lead to thrombosis. The main agent used is diazepam, but other substances being used include codeine, brick dust and, in one gruesome instance which saw a young woman developing blocked veins, Polyfilla.» —“‘One young lad said he was on a mission to die'” by Martyn McLaughlin The Herald (Glasgow, Scotland) July 12, 2006. (source: Double-Tongued Dictionary)